8 
INTRODUCTION. 
Therefore being deprived of all my first la- 
bors in Botany, Zoology, and Mineralogy in 
that memorable year 1815, I had to begin 
again my researches and collections, which I 
pursued ever since with renewed zeal, always 
at my own sole expense. I spent 1815 and 
1816 in the States of New York, New Jersey, 
and Pennsylvania chiefly. In 1816 I went to 
explore as far as Lake Champlain, Vermont, 
and the Saranac Mountains, near the sources 
of the Hudson River. In 1817 I went to the 
Mattawan and Kiskanom, or Catskill Moun- 
tains, and explored Long Island, where 1 dwelt 
awhile. 
But my great travels in the West began in 
1818, I made a tour of 2666 miles as far as the 
Wabash River, crossing twice the Alleghany 
Mountains on foot, and exploring Ohio, In- 
diana, Illinois, Kentucky, &,c. Some of the 
results of my former discoveries in that jour- 
ney were published in 1819, in the Physical 
Journal of Paris, in 86 new Gen. of Plants, and 
76 New Gen. of Animals. 
Having been appointed Professor of Natural 
Sciences in the University of Lexington, in 
Kentucky, I went there in 1819, crossing a 
third time the Alleghany Mountains, through 
the Cumberland road of Maryland, still on foot, 
as I never would cross these beautiful moun- 
tains in any other way, in order to botanize all 
the while, and I was rewarded by many new 
plants. 
I spent seven years in Kentucky in 1826, 
exploring that State thoroughly, and making 
excursions to Ohio, & c., my longest journeys 
were in 1823, when I went West as far as the 
Rivers Cumberland and Tennessee near their 
